US3711749A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reed switch
Assignee: Individual
•
Filing: 1971-10-07
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Granted: 1973-01-16
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Expires: 1991-10-07
Abstract
Abstract A reed type electromagnetic circuit switch designed mainly for operation in power circuits of switchgear installations, as well as in automatic control and electric drive systems where the power handled may amount to tens of thousands of voltamperes and rated currents may reach tens and hundreds of amperes; the current circuit of the reed switch is made up of solid current leads, a flexible shunt, and contact tips, manufactured from materials possessing high electrical conductivity. The arrangement includes an armature consisting of a ferromagnetic reed member and thinner ferromagnetic strips and provides for high electromagnetic pull and contact pressure, while a shield and a loop increase the reliability of the reed-to-reed insulation in the off-position and make it possible to develop most reliable and wear resistant contactors. An electromagnet is arranged to attract the armature, and has poles which are introduced into a sealed casing, while the coil of the electromagnet is disposed outside the casing.
Inventors
- 👤 M Koblents
- 👤 G Mitskevich
- 👤 E Polovets
- 👤 A Zhevago
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 14:27
CPC Classifications
H; H01; H01H; H01H51/00; H01H51/28; H01H51/281
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
230 words
A high-power reed switch for switching an electric circuit, comprising: a casing and at least two contact members arranged therein in apposition, the first of said two contact members being fixed and having a high conductivity lead, the second of said two contact members being movable; a magnetic member provided with means to induce magnetic flux therein and having an open frame-like configuration with two substantially parallel butt end faces formed at the ends of two spaced limbs of the magnetic member; a resilient ferromagnetic elongated member secured at one end thereof to said second contact member and secured and cantilevered at the other end thereof with the first of said two butt end faces, said resilient elongated member being so disposed as to form an air-gap at a switch ''''OFF'''' position between said elongated member and the second of the said butt end faces, said air-gap being at a distance from said two contact members; and a second high conductivity lead passing through said casing and having a flexible conductive lead attached to the second high conductivity lead at one end thereof and to said second movable contact member at the other end, whereby said resilient ferromagnetic elongated member forms part of an uninterrupted magnetic circuit provided by said magnetic member so as to minimize leakage flux, and increase the switch current rating in view of said flexible lead.
Claim 2
Dependent Claim
230 words
A high-power reed switch for switching an electric circuit, comprising: a casing and at least two contact members arranged therein in apposition, the first of said two contact members being fixed and having a high conductivity lead, the second of said two contact members being movable; a magnetic member provided with means to induce magnetic flux therein and having an open frame-like configuration with two substantially parallel butt end faces formed at the ends of two spaced limbs of the magnetic member; a resilient ferromagnetic elongated member secured at one end thereof to said second contact member and secured and cantilevered at the other end thereof with the first of said two butt end faces, said resilient elongated member being so disposed as to form an air-gap at a switch ''''OFF'''' position between said elongated member and the second of the said butt end faces, said air-gap being at a distance from said two contact members; and a second high conductivity lead passing through said casing and having a flexible conductive lead attached to the second high conductivity lead at one end thereof and to said second movable contact member at the other end, whereby said resilient ferromagnetic elongated member forms part of an uninterrupted magnetic circuit provided by said magnetic member so as to minimize leakage flux, and increase the switch current rating in view of said flexible lead.
Claim 3
Dependent Claim
69 words
A high-power reed switch for switching electric circuits, according to claim 1, in which: said casing is made up of at least two end parts and a middle part, the first of said two end parts being metallic and being coupled with part of said magnetic member whose said first butt end face is accommodated within the casing, the middle part of the casing being made from insulating material.
Claim 4
Dependent Claim
101 words
A high-power reed switch for switching electric circuits, according to claim 2, in which: said resilient ferromagnetic member is made in the form of a single ferromagnetic strip carrying said second contact tip, and is fitted with at least two further resilient ferromagnetic strips of lower thickness and length to form a stack, each strip being fixed with its one end to said first butt end surface, while the entire stack rests upon the projection of an elongated current lead, said first butt end surface being displaced relative to the second butt end surface in a direction away from said contact-members.
Claim 5
Dependent Claim
60 words
A high-power reed switch for switching electric circuits, according to claim 3, in which: said part of the casing made from insulating material is shaped in its sectional region to form a loop, and wherein the insulating part is fastened to the metal casing so that its end partially shields the insulating part of the casing from the contact tips.
Claim 6
Dependent Claim
59 words
A high-power reed switch for switching electric circuits, according to claim 4, iN which: said first butt end surface fixed with the ends of the single resilient ferromagnetic strip and said at least two further resilient ferromagnetic strips, as well as said elongated current lead are introduced into and coupled with said metallic first end part of the casing.
Claim 7
Dependent Claim
111 words
A reed switch according to claim 4, wherein said means to induce magnetic flux in said magnetic member comprises a d.c. coil, the reed switch further including a rectifier, an an additional current winding wound on said magnetic member, said rectifier and said additional current winding being connected in series with said first and second contacts, so that said additional current winding aids the magnetic flux in the magnetic member, and upon connection of the reed switch to an a.c. line, the flux due to the additional current winding dies out at the first current zero of the a.c. line and said first and second contacts can stay separated without chattering.
Claim 8
Dependent Claim
54 words
A reed switch as in claim 1 wherein said means for inducing magnetic flux in said magnetic member comprises d.c. coil capable of producing magnetic flux simultaneously in a plurality of reed switches, and said resilient ferromagnetic elongated member forms part of an uninterrupted magnetic circuit in an ''''ON'''' position of the reed switch.
Claim 9
Dependent Claim
128 words
A contactor assembly for an a.c. circuit, including a high-power reed switch as in claim 7, and further second and third reed switches connected in parallel therewith, said second and third reed switches each having an additional magnetizing current coil disposed on the corresponding magnetic member, and a diode connected in series with corresponding set of first and second contact members, the corresponding contact members of the second and third reed switches having an inherent drop-out time longer than that of said first switch, so that, after an ''''OFF'''' operation of the contactor assembly, one of said second and third reed switches remains closed during a half cycle of the a.c. circuit power when its diode is conductive, providing thereby an arcless interruption of the a.c. circuit load.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-01-16 | 1976-07-17 | 1977-01-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-16 | 1980-07-17 | 1981-01-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-16 | 1984-07-17 | 1985-01-16 | $7700.00 | Window Closed / Lapsed |